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(Circulation. 2000;102:1503.)
© 2000 American Heart Association, Inc.
Clinical Investigation and Reports |
From the University of Michigan Medical Center (B.P.); Wake Forest University School of Medicine (R.P.B., C.D.F., M.E.M., W.R.); University of Minnesota Hospital/Clinic (D.B.H.); and University of British Columbia (G.B.J.M.).
Correspondence to Bertram Pitt, MD, Department of Internal Medicine, Division of Cardiology, University of Michigan Medical Center, 1500 East Medical Center Drive, 3910 Taubman Center, Ann Arbor, MI 48109-0366.
BackgroundThe results of angiographic studies have suggested that calcium channelblocking agents may prevent new coronary lesion formation, the progression of minimal lesions, or both.
Methods and ResultsThe Prospective Randomized Evaluation of the Vascular Effects of Norvasc Trial (PREVENT) was a multicenter, randomized, placebo-controlled, double-masked clinical trial designed to test whether amlodipine would slow the progression of early coronary atherosclerosis in 825 patients with angiographically documented coronary artery disease. The primary outcome was the average 36-month angiographic change in mean minimal diameters of segments with a baseline diameter stenosis of 30%. A secondary hypothesis was whether amlodipine would reduce the rate of atherosclerosis in the carotid arteries as assessed with B-mode ultrasonography, which measured intimal-medial thicknesses (IMT). The rates of clinical events were also monitored. The placebo and amlodipine groups had nearly identical average 36-month reductions in the minimal diameter: 0.084 versus 0.095 mm, respectively (P=0.38). In contrast, amlodipine had a significant effect in slowing the 36-month progression of carotid artery atherosclerosis: the placebo group experienced a 0.033-mm increase in IMT, whereas there was a 0.0126-mm decrease in the amlodipine group (P=0.007). There was no treatment difference in the rates of all-cause mortality or major cardiovascular events, although amlodipine use was associated with fewer cases of unstable angina and coronary revascularization.
ConclusionsAmlodipine has no demonstrable effect on angiographic progression of coronary atherosclerosis or the risk of major cardiovascular events but is associated with fewer hospitalizations for unstable angina and revascularization.
Key Words: amlodipine atherosclerosis angiography ultrasonics trials angina revascularization
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